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Oxamyl (Vydate) - Chemical Profile 10/85

EPA CHEMICAL PROFILE
CHEMICAL IDENTITY -- OXAMYL
Date: October 31, 1985
Revision:
CAS Registry Number: 23135-22-0

- Synonyms: (NIOSH/RTECS 1983 Synonyms, Volume 2, p. 910):  Oxamimidic
  Acid, N',N'-Dimethyl-N-((Methylcarbamoyl)oxy)-1(Methylthio); D-1410;
  2-Dimethylamino-1-(Methylthio)Glyoxal O-Methylcarbamoylmonoxime;
  DPX 1410; Insecticide-Nematicide 1410; Thioxamyl; Vydate; Methyl 2-
  (Dimethylamino)-N-(((Methylamino)Carbonyl)Oxy)-2-0xoethanimidothioate;
  S-Methyl 1-(Dimethylcarbamoyl)-N-(Methylcarbamoyl)Oxy)Thioformimidate;
  Methyl N',N'-Dimethyl-N-((Methylcarbamoyl)Oxy)-1-Thiooxamimidate;
  Vydate L Oxamyl Insecticide/Nematocide
- (Hayes 1982 Synonyms, p. 457)  N,N-Dimethyl-alpha-Methylcarbamoyl-
  oxyimino-alpha-(Methylthio)acetamide
- Chemical Formula:  C7Hl3N303S
- Molecular Weight: 219.29

SECTION I -- HAZARDOUS INGREDIENTS/IDENTITY INFORMATION

- OSHA PEL:  Not Found
- ACGIH TLV:  Not Found
- IDLH: Not Found
- Other Limits Recommended: Toxicity information:  LC50 inhalation
  (rat) 0.17 mg/liter/l hour (*NIOSH/RTECS 1985)

SECTION II -- PHYSICAL/CHEMICAL CHARACTERISTICS

- Boiling Point:  Not Found
- Specific Gravity (H20=1):  Not Found

- Vapor Pressure (mmHg):  2.3xlO to the minus 4 at 25 degrees C
  (Hayes 1982, p. 457)
- Melting Point: 212-216 degrees F, 100-102 degrees C; changes to form
  melting at 226-230 degrees F, 108-110 degrees C (Hayes 1982, p. 457)
- Vapor Density (AIR=l):  Not Found
- Evaporation Rate (Butyl acetate=l):  Not Found
- Solubility in Water: Solubility 28 g/100 g at 25 degrees C (Farm
  Chemicals Handbook 1984, p. C170)
- Appearance and Odor: White, crystalline solid (Farm Chemicals Handbook
  1984, p. C170) with slight sulfurous odor (Hayes 1982, p. 457).

SECTION III -- FIRE AND EXPLOSION HAZARD DATA

- Flash Point (Method Used):  Not Found
- Flammable Limits:
  LEL: Not Found
  UEL: Not Found
- Extinguishing Methods: This is a solid carbamate pesticide (Hayes
  1982, p. 457).  Extinguish fire using agent suitable for type of
  surrounding fire, as the material itself does not burn or burns with
  difficulty.  Use water in flooding quantities as a fog.  Use alcohol
  foam, carbon dioxide or dry chemical (Student 1981, p. 104).
- Special Fire Fighting Procedures: This is a solid carbamate pesticide
  (Hayes 1982, p. 457).  Move container from fire area.  Fight fire from
  maximum distance.  Dike fire control water for later disposal; do not
  scatter the material.  Wear positive pressure breathing apparatus and
  special protective clothing (DOT 1984, Guide 55).

- Unusual Fire and Explosion Hazards: When heated to decomposition, it
  emits toxic fumes of nitrogen oxides and sulfur oxides (Sax 1984, p.
  1174).  This is a solid carbamate pesticide (Hayes 1982, p. 457).
  Container may explode in heat of fire (DOT 1984, Guide 55).

SECTION IV -- REACTIVITY DATA

- Stability: Unstable:
  Stable: Yes (Hayes 1982, p . 457 )
- Conditions to Avoid: Not Found
- Incompatibility (Materials to Avoid):  Not Found
- Hazardous Decomposition or Byproducts: When heated to decomposition,
  hazardous fumes of nitrogen oxides and sulfur oxides may be emitted
  (Sax 1984, p. 1174).
- Hazardous Polymerization: May Occur Not Found:
  May Not Occur: Not Found
- Conditions to Avoid: Not Found

SECTION V -- HEALTH HAZARD DATA

- Routes of Entry: Inhalation: Yes (Sax 1984, p. 1174)
                   Skin: Yes (Gosselin 1984, p. II-308)
                   Ingestion: Yes (Hayes 1982, p. 458)
- Health Hazards (Acute, Delayed, and Chronic):  Classified by the World
  Health Organization as highly hazardous (Encyc Occupat. Health and
  Safety 1983, p. 1622).  Has also been rated as extremely to supertoxic
  (Gosselin 1984, p. II-308).  Acute oral exposure (ingestion) to oxamyl
  has caused death (Hayes 1982, p. 458).  Oxamyl is a potent
  cholinesterase inhibitor (Gosselin 1984, p. II-308).
- Signs and Symptoms of Exposure: Symptoms include weakness, blurred
  vision, nausea, abdominal cramps, constricted pupils, sweating and
  muscle tremors.  Oral, dermal, and ocular exposure may produce
  poisoning, although dermal absorption is slow (Gosselin 1984,
  p. II-308).
- Medical Conditions Generally Aggravated by Exposure: Not Found
- Emergency and First Aid Procedures: This is a solid carbamate
  pesticide (Hayes 1982, p. 457).  Move victim to fresh air; call
  emergency medical care.  If not breathing, give artificial respira-
  tion.  If breathing is difficult, give oxygen.  In case of contact
  with material, immediately flush skin or eyes with running water for
  at least 15 minutes.  Speed in removing material from skin is of
  extreme importance.  Remove and isolate contaminated clothing and
  shoes at the site.  Keep victim quiet and maintain normal body
  temperature.  Effects may be delayed; keep victim under observation
  (DOT 1984, Guide 55).

SECTION VI -- USE INFORMATION

- Used as an insecticide, nematicide and acaricide on many field crops,
  vegetables, fruits, and ornamentals (Farm Chemicals Handbook 1984,
  p. C170).

SECTION VI I -- PRECAUTIONS FOR SAFE HANDLING AND USE
(Steps to be Taken in Case Material is Released or Spilled)

- This is a solid carbamate pesticide (Hayes 1982, p. 457).  Keep
  unnecessary people away; isolate hazard areas and deny entry.  Stay
  upwind, keep out of low areas.  Wear positive pressure breathing
  apparatus and special protective clothing including boots, gloves and
  goggles.  Do not touch spilled material, or breathe the vapors, dusts
  or fumes from burning materials.  Do not handle broken packages
  without protective equipment.  Wash away any material that may have
  contacted the body with soap and water (Student 1981, p. 104; DOT
  1984, Guide 55).

COMMENTS

Sources searched but no information found:
   ACGIH 1984
   NIOSH/OSHA 1978
   Merck 1983
   Gilman 1985
   Weiss 1980
   Clayton and Clayton 1981-82
   Student 1981
   Arena 1978